BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended		9 Months Ended	12 Months Ended		17 Months Ended
	Jun. 30, 2015 USD ($) aircraft	Jun. 30, 2014 USD ($) aircraft	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($) aircraft	Mar. 31, 2014 USD ($) aircraft	Apr. 30, 2015 USD ($)
Foreign Currency [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	$ 3,900,000	$ (400,000)
Impact of Foreign Exchange Rates on Unconsolidated affiliates	1,700,000	400,000
Revenues	466,996,000	472,538,000
Operating expense	(460,763,000)	(412,237,000)
Earnings from unconsolidated affiliates, net of losses	6,296,000	4,281,000
Income before provision for income taxes	1,004,000	56,826,000
Provision for income taxes	(2,633,000)	(11,823,000)
Net income	(1,629,000)	45,003,000
Total stockholders' investment	1,613,756,000			$ 1,618,786,000
Interest income	221,000	236,000
Interest and Debt Expense	(7,890,000)	(7,363,000)
Interest expense, net	(7,669,000)	(7,127,000)
Write-off of deferred debt financing fees	0	164,000
Accretion of redeemable noncontrolling interests	6,301,000	$ 0
Inventory allowance	48,100,000			45,400,000
Additional allowances	5,400,000
Prepaid expenses and other current assets	$ 60,640,000			70,091,000
Number of aircraft delivered | aircraft	2	9
Capital expenditures	$ 67,777,000	$ 200,447,000
Payments for PP&E	$ 28,300,000	$ 161,000,000
Number of aircraft sold or disposed of | aircraft	9	4
Proceeds from asset dispositions	$ 9,301,000	$ 6,643,000
Gain on sale or disposal of assets	$ (7,695,000)	$ 610,000
Number of aircraft impaired | aircraft	9	4
Impairment charges on aircraft held for sale	$ 9,862,000	$ 2,579,000
Accelerated depreciation	10,500,000
Deferred sale leaseback advance	$ 0			$ 55,934,000
Proceeds from assignment of aircraft purchase agreements					$ 106,100,000
Number of aircraft assigned future payments | aircraft					7
Additional proceeds from assignment of aircraft purchase agreement						$ 147,400,000
Number of aircraft movement into (out of) deferred sale leaseback advance | aircraft	(2)			(5)
Deferred sale leaseback completion and interim lease payments	$ 75,800,000			$ 183,700,000
Removal of Deferred Sale Leaseback Advance	74,300,000			182,600,000
Affiliated Entity [Member]
Foreign Currency [Line Items]
Allowance for Doubtful Accounts Receivable, Current	0			0
Non Affiliated Entity [Member]
Foreign Currency [Line Items]
Allowance for Doubtful Accounts Receivable, Current	5,100,000			900,000
U.K. SAR and Norway Client [Member]
Foreign Currency [Line Items]
Deferred Set-up Costs, Current	13,100,000			8,900,000
Amortization of other deferred charges	1,000,000
Deferred set-up costs, noncurrent	48,200,000			$ 42,400,000
Air Transportation Equipment [Member]
Foreign Currency [Line Items]
Capital expenditures	40,462,000	172,098,000
Gain on sale or disposal of assets	2,167,000	3,189,000
Other Capitalized Property
Foreign Currency [Line Items]
Capital expenditures	$ 27,315,000	$ 28,349,000
Medium Aircraft [Member]
Foreign Currency [Line Items]
Number of aircraft delivered | aircraft	1	3
Number of aircraft in exit plan | aircraft	14
Large Aircraft [Member]
Foreign Currency [Line Items]
Number of aircraft delivered | aircraft	1	6
Number of aircraft in exit plan | aircraft	4
Fixed Wing Aircraft [Member]
Foreign Currency [Line Items]
Number of aircraft in exit plan | aircraft	1
Assets Held-for-sale [Member]
Foreign Currency [Line Items]
Impairment charges on aircraft held for sale	$ 9,862,000	$ 2,579,000
Quarter To Date [Member] | One British Pound Sterling Into Us Dollars [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.57	1.71
Quarter To Date [Member] | One British Pound Sterling Into Us Dollars [Member] | Maximum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.59	1.71
Quarter To Date [Member] | One British Pound Sterling Into Us Dollars [Member] | Weighted Average [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.53	1.68
Quarter To Date [Member] | One British Pound Sterling Into Us Dollars [Member] | Minimum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.46	1.66
Quarter To Date [Member] | One Euro Into Us Dollars [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.11	1.37
Quarter To Date [Member] | One Euro Into Us Dollars [Member] | Maximum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.14	1.39
Quarter To Date [Member] | One Euro Into Us Dollars [Member] | Weighted Average [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.11	1.37
Quarter To Date [Member] | One Euro Into Us Dollars [Member] | Minimum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.06	1.35
Quarter To Date [Member] | One Australian Dollar Into Us Dollars [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.77	0.94
Quarter To Date [Member] | One Australian Dollar Into Us Dollars [Member] | Maximum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.81	0.94
Quarter To Date [Member] | One Australian Dollar Into Us Dollars [Member] | Weighted Average [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.78	0.93
Quarter To Date [Member] | One Australian Dollar Into Us Dollars [Member] | Minimum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.76	0.92
Quarter To Date [Member] | One Norwegian Kroner Into Us Dollars [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.1267	0.1649
Quarter To Date [Member] | One Norwegian Kroner Into Us Dollars [Member] | Maximum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.1370	0.1753
Quarter To Date [Member] | One Norwegian Kroner Into Us Dollars [Member] | Weighted Average [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.1291	0.1717
Quarter To Date [Member] | One Norwegian Kroner Into Us Dollars [Member] | Minimum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.1234	0.1638
Quarter To Date [Member] | One Nigerian Naira Into Us Dollars [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.0050	0.0062
Quarter To Date [Member] | One Nigerian Naira Into Us Dollars [Member] | Maximum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.0051	0.0063
Quarter To Date [Member] | One Nigerian Naira Into Us Dollars [Member] | Weighted Average [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.0051	0.0062
Quarter To Date [Member] | One Nigerian Naira Into Us Dollars [Member] | Minimum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.0050	0.0061
Quarter To Date [Member] | One Brazilian Real Into Us Dollars [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.3184	0.4538
Quarter To Date [Member] | One Brazilian Real Into Us Dollars [Member] | Maximum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.3435	0.4572
Quarter To Date [Member] | One Brazilian Real Into Us Dollars [Member] | Weighted Average [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.3258	0.4493
Quarter To Date [Member] | One Brazilian Real Into Us Dollars [Member] | Minimum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.3108	0.4391
Quarter To Date [Member] | Impact of Changes in Foreign Currency Exchange Rates [Member]
Foreign Currency [Line Items]
Revenues	$ (40,068,000)
Operating expense	33,957,000
Earnings from unconsolidated affiliates, net of losses	1,386,000
Non-operating expense	4,255,000
Income before provision for income taxes	(470,000)
Provision for income taxes	108,000
Net income	(362,000)
Cumulative translation adjustment	14,714,000
Total stockholders' investment	14,352,000
Senior Notes [Member] | Senior Notes Due 2022 [Member]
Foreign Currency [Line Items]
Write-off of deferred debt financing fees		$ 164,000
Debt instrument, repurchase amount		11,300,000
Other income (expense)		$ 900,000
Scenario, Forecast [Member]
Foreign Currency [Line Items]
Accelerated depreciation			$ 9,800,000
Airnorth [Member]
Foreign Currency [Line Items]
Accretion of redeemable noncontrolling interests	1,200,000
Eastern Airways [Member]
Foreign Currency [Line Items]
Accretion of redeemable noncontrolling interests	$ 5,100,000